Rabbit: Fixes debug message format
Rabbit: Fixes debug message format

Add the missing 's' for the message format and
just print the number queues instead of print a list
full of '<object object at 0xXXXXXXXXXX>'.

Change-Id: Idaab4057bc6a41523a1944ae0c8e15e5e885b390

hkumarmk/oslo.messaging,zhurongze/oslo.messaging,ozamiatin/oslo.messaging,apporc/oslo.messaging,dims/oslo.messaging,dukhlov/oslo.messaging,magic0704/oslo.messaging,dukhlov/oslo.messaging,hkumarmk/oslo.messaging,dims/oslo.messaging,isyippee/oslo.messaging,apporc/oslo.messaging,stevei101/oslo.messaging,ozamiatin/oslo.messaging,stevei101/oslo.messaging,zhurongze/oslo.messaging,isyippee/oslo.messaging,magic0704/oslo.messaging